362 Syrphidae. 



frons are yellow; the hairs yellow. Antennæ a little larger than in 

 the male. Thorax and scutellum all quite short-haired. Abdomen 

 with the basal spots larger and broader than in the male, less widely 

 separated, The dark rings on anterior tibiæ quite small. 



Length about 15 mm. 



This species is very similar to a Conops or Physocephala, perhaps 

 especially to P. nigra, and also to an Eumenes; Verrall thinks that 

 both the Gonopid and the Doros have independently mimicked the 

 Wasp, though it is not possible to see the reason for this with regard 

 to the Doros sueh as perhaps with regard to the Gonopid. — As seen 

 the species may vary somewhat, especially with regard to the colour 

 of epistoma; no doubt therefore the D. destillatorius Mik (Wien. ent. 

 Zeitg. IV, 53) and the D. conopseus var. hipunctatiis Mik (Verh. zool. 

 bot. Geseli. Wien, XXXV, 328), which the author thinks may perhaps 

 be a distinct species, are only varieties, as already declared by Verrall, 

 who possessed the types to both species. 



D. conopseus is rare in Denmark, I know only five specimens, all 

 females; Sealand, without particular locality (Løvendal), Bøllemosen 

 (Schlick), Brede, Tyvekrog (Godskesen), and on Lolland at Maribo 

 (Schlick). The dates are ''''k.—^li. 



Geographical distribution : — Europe down into Italy ; towards 

 the north to middle Sweden ; it is everywhere rather rare. 



23. Bacclia Fabr. 



Species of not small size but of very elongate and slender shape ; 

 the colour dark æneous with small, yellow abdominal bands. Head 

 somewhat long, especially in the male and here almost conical; it is 

 considerably broader than thorax, excavated behind. Eyes very large, 

 touching for a rather long distance in the male, somewhat narrowly 

 separated in the female; frons and epistoma rather narrow. Eyes 

 bare, the facets distinctly enlarged above in the male. Antennæ 

 inserted in the middle of the head; they are short, third joint roundish; 

 arista thickened at the base, apparently bare; the antennæ slightly 

 larger in the female than in the male. Epistoma evenly retreating; 

 it is not hoilowed below the antennæ and has a small central knob, 

 below which it is again retreating; the oral aperture is simply 

 elongated as the front edge is not curved upwards and there are no 

 lateral angles between the front and the side mouth edges. The 

 epistoma is black, at most a little yellow at the mouth edge or on 

 the sides below; it has short, fme hairs. Jowls very small and narrow, 

 in front of them a little pit. Oral cone somewhat short; clypeus 



